It was under the idol tag, one of the guys was a famous idol (will call F/I) and the other was either an idol in training or his assistant (will call ToA) but the ToA guy HATED the F/I, and it ended up being because the F/I idol always accepted rings from his fans and the ToA was the F/I idol's only male fan and never wore the ring he gave him so T......
The descriptions are so detailed and helpful
Honestly I thought that rather than envy it was shock and maybe worry?? For them to have been intimate and known eachother for so long and for Rail to never have seen him make that face it means that Kouichi is SPECIAL to him, and that kind of pride and soft peaceful smile looked a lot like love??? My theory is that he's worried that Dyne is in love with Caius's bride to be and if he were to be found out, or if he decides to act on it- It would absolutely get him killed